Question

factor the expression using the gcf.
the expression $21m - 49n$ factored using the gcf is $\square$.

Explanation:

Step1: Find GCF of 21 and 49

Factors of 21: \(1, 3, 7, 21\)
Factors of 49: \(1, 7, 49\)
GCF is \(7\).

Step2: Factor out GCF

\(21m - 49n = 7(3m) - 7(7n) = 7(3m - 7n)\)

Answer:

\(7(3m - 7n)\)